I'm sure that you like me have BFBO's (Blinding Flash of the Bloody Obvious).
My latest was realising that it wasn't clear to people that I provide one-off as well as regular professional services.
I've rectified this now at my website and via the one page flyer (pictured) which you can download here. Most importantly where appropriate in conversation I'm letting people know.
What is it about your product/s and/or service/s your best customers/clients are actually unaware of?